A simple proof of Kwapien's theorem
The purpose of this paper is to prove in a self-contained way Kwapien's theorem that gives a criterion for Hilbertizablity of normed spaces. The original proof by \textit{S. Kwapien} [Stud. Math. 44, 583-595 (1972; Zbl 0256.46024)] has required much more complicated discussions. Many authors have investigated relating problems, but their researches are based on mutual quotations, thus it is difficult to follow their studies for readers not so familiar in the topic. So this self-contained proof has some meaning.
scientific article; zbMATH DE number 3927639